Fabrication of WC and WC(Co) Codeposited Nickel Composite Coating by Electroplating Method for the Replacement of Chromium Coating

Abstract

The codeposition of fine WC and Co coated WC particles from nickel Watt’s bath has
been investigated. Electroplating of Ni/WC and Ni/WC(Co) composites coating were carried out
at different current density with variation of particle size. The effect of hydrodynamic conditions of
the codeposition of Ni/WC bath has been investigated. The Guglielmi adsorption mechanism is
applied to the electroplating of the fine WC and WC(Co) in Ni matrix. The adsorption rate of
determination step is controlled by the transferal process of loose adsorption to strong adsorption.
The embedded WC concentration can be increased both by increasing electrical current density and
additional WC concentration in the bath.